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Here it is: A.B. Moler, The Barbers' Manual 1911, revised edition 1926 p.38

"There is a friction in stropping on the canvas that heats the metal, thereby expanding it and bringing it out to a...

Here's a thought: I believe this thread opened (I'm too lazy to go back and read the first post) with the idea that barbers stropped first on the canvas side to heat the razor blade and prepping the...